<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="../js/vue.js"></script>

</head>
<body>
<div id="app">
    <h2>当前计数:{{counter}}</h2>
    <!--响应-->
    <!--    <button v-on:click="counter++">+</button>-->
    <!--    <button v-on:click="counter&#45;&#45;">-</button>-->
    <button v-on:click="add">+</button>
    <button v-on:click="sub">-</button>
</div>
<script>
    /*语法糖：简写*/
    //代理
    const obj = {
        counter: 0
    };
    const app = new Vue({
        el: '#app',
        data: obj,
        methods: {
            add: function () {
                console.log("add被执行")
                /*this表示当前对象*/
                this.counter++
            },
            sub: function () {
                console.log("sub被执行")
                this.counter--
            }
        }
    })
</script>
</body>
</html>